Lighting apparauts

Abstract

Disclosed is a lighting device. The lighting device includes: a light source unit; a first optical exciter and a second optical exciter converting lights emitted from the light source unit into lights having different color temperatures from each other and different color coordinates from each other; a third optical exciter emitting light having a color coordinate and a color temperature which are different from those of the light converted by the second optical exciters; a sensor outputting a first component signal, a second component signal and a third component signal, each of which corresponds to light quantities of a first component, a second component and a third component, respectively, of the light output from the first optical exciter, the second optical exciter and the third optical exciter; a controller controlling light quantity of the light source unit such that a color coordinate of the light emitted from the first optical exciter, a color coordinate of the light emitted from the second optical exciter, and a color coordinate of the light emitted from the third optical exciter are placed within an area formed by the color coordinates of the first optical exciter, the second optical exciter and the third optical exciter; and a power supplier supplying voltage changing the light quantity of the light source unit under the control of the controller.

What is claimed is: 
     
       1. A lighting apparatus comprising:
 a light source unit which includes an LED (light emitting diode); 
 a first optical exciter and a second optical exciter converting lights emitted from the light source unit into lights having different color temperatures from each other and different color coordinates from each other; 
 a third optical exciter emitting light having a color coordinate and a color temperature which are different from those of the light converted by the second optical exciter; 
 a sensor outputting a first component signal, a second component signal, and a third component signal, wherein the first component signal corresponds to a light quantity of a first component of the light output from the first optical exciter, the second component signal corresponds to a light quantity of a second component of the light output from the second optical exciter, and the third component signal corresponds to a light quantity of a third component of the light output from the third optical exciter; 
 a controller controlling light quantity of the light source unit such that a color coordinate of the light emitted from the first optical exciter, a color coordinate of the light emitted from the second optical exciter, and a color coordinate of the light emitted from the third optical exciter are placed within an area formed by the color coordinates of the first optical exciter, the second optical exciter, and the third optical exciter; 
 a power supplier supplying voltage changing the light quantity of the light source unit under the control of the controller; and 
 a memory having standard color coordinates located within an area formed by the color coordinates of the light output from the first optical exciter, the second optical exciter, and the third optical exciter, wherein the controller receives the first component signal, the second component signal, and the third component signal from the sensor, generates a comparative color coordinate, compares the comparative color coordinate with a standard color coordinate read from the memory, and controls light quantity of the light source unit in such a manner as to reduce an error value between the standard color coordinate and the comparative color coordinate. 
 
     
     
       2. The lighting apparatus of  claim 1 , wherein the light source unit includes LEDs having the same color temperature. 
     
     
       3. The lighting apparatus of  claim 1 , wherein the first optical exciter, the second optical exciter, and the third optical exciter each comprises a luminescent film, and wherein each luminescent film comprises a fluorescent substance located between resin layers. 
     
     
       4. The lighting apparatus of  claim 1 , wherein the sensor comprises a first filter, a second filter, and a third filter. 
     
     
       5. The lighting apparatus of  claim 1 , wherein the third optical exciter comprises a plurality of optical exciters, and wherein at least two third optical exciters emit lights having mutually different color temperatures and mutually different color coordinates. 
     
     
       6. The lighting apparatus of  claim 1 , wherein the first optical exciter and the second optical exciter emit white light. 
     
     
       7. The lighting apparatus of  claim 1 , wherein the power supplier supplies alternating current voltage having a controlled duty ratio under the control of the controller. 
     
     
       8. The lighting apparatus of  claim 7 , wherein the light source unit includes LEDs and wherein a light quantity of the LEDs changes depending on the duty ratio of the alternating current voltage. 
     
     
       9. The lighting apparatus of  claim 1 , wherein the second optical exciter and the third optical exciter are arranged adjacently to the first optical exciter, and wherein the second optical exciter and the third optical exciter are alternately arranged. 
     
     
       10. The lighting apparatus of  claim 1 , wherein the standard color coordinates are set according to a black body locus, MacAdam curve, and Ansi bin curve. 
     
     
       11. The lighting apparatus of  claim 1 , wherein light of the first component has red component, light of the second component has green component, and light of the third component has blue component. 
     
     
       12. A lighting apparatus comprising:
 a first light source unit and a second light source unit each including an LED and emitting lights having different color temperatures from each other and different color coordinates from each other; 
 a third light source unit including an LED and emitting light having a color coordinate and a color temperature which are different from those of the second light source unit; 
 a sensor outputting a first component signal, a second component signal, and a third component signal, wherein the first component signal corresponds to a light quantity of a first component of the light output from the first light source unit, the second component signal corresponds to a light quantity of a second component of the light output from the second light source unit, and the third component signal corresponds to a light quantity of a third component of the light output from the third light source unit; 
 a controller controlling light quantities of the first light source unit, the second light source unit, and the third light source unit such that a color coordinate of the light emitted from the first light source unit, a color coordinate of the light emitted from the second light source unit, and a color coordinate of the light emitted from the third light source unit are placed within an area formed by the color coordinates of the first light source unit, the second light source unit, and the third light source unit; 
 a power supplier supplying voltage changing the light quantities of the first light source unit, the second light source unit, and the third light source unit under the control of the controller; and 
 a memory having standard color coordinates located within an area formed by the color coordinates of the light output from the first light source unit, the second light source unit, and the third light source unit, wherein the controller receives the first component signal, the second component signal, and the third component signal from the sensor, generates a comparative color coordinate, compares the comparative color coordinate with a standard color coordinate read from the memory, and controls light quantities of the first light source unit, the second light source unit, and the third light source unit in such a manner as to reduce an error value between the standard color coordinate and the comparative color coordinate. 
 
     
     
       13. The lighting apparatus of  claim 12 , wherein the third light source unit comprises a plurality of light source units, and wherein at least two third light source units emit lights having mutually different color temperatures and mutually different color coordinates. 
     
     
       14. The lighting apparatus of  claim 12 , wherein the first light source unit and the second light source unit emit white light. 
     
     
       15. The lighting apparatus of  claim 12 , wherein the power supplier supplies alternating current voltage having a controlled duty ratio under the control of the controller. 
     
     
       16. The lighting apparatus of  claim 15 , wherein the first light source unit, the second light source unit, and the third light source unit include LEDs, and wherein a light quantity of the LEDs changes depending on the duty ratio of the alternating current voltage. 
     
     
       17. The lighting apparatus of  claim 12 , wherein the standard color coordinates are set according to a black body locus, MacAdam curve, and Ansi bin curve. 
     
     
       18. The lighting apparatus of  claim 12 , wherein color distribution at each color temperature of lights emitted from the first light source unit, the second light source unit, and the third light source unit is within step  3 . 
     
     
       19. A lighting apparatus comprising:
 a first light source unit, a second light source unit, and a third light source unit each including an LED which emit light having a color coordinate and a color temperature; 
 a sensor outputting a first component signal, a second component signal, and a third component signal, wherein the first component signal corresponds to a light quantity of the light output from the first light source unit, the second component signal corresponds to a light quantity of the light output from the second light source unit, and the third component signal corresponds to a light quantity of the light output from the third light source unit; 
 a controller controlling light quantities of the first light source unit, the second light source unit, and the third light source unit such that a first color coordinate of the light emitted from the first light source unit, a second color coordinate of the light emitted from the second light source unit, and a third color coordinate of the light emitted from the third light source unit are placed within an area formed by the color coordinates of the first light source unit, the second light source unit, and the third light source unit; and 
 a memory having standard color coordinates located within an area formed by the color coordinates of the light output from the first light source unit, the second light source unit, and the third light source unit, 
 wherein the controller receives the first component signal, the second component signal, and the third component signal from the sensor, generates a comparative color coordinate, compares the comparative color coordinate with the standard color coordinate read from the memory, and controls light quantities of the first light source unit, the second light source unit, and the third light source unit in such a manner as to reduce an error value between the standard color coordinate and the comparative color coordinate. 
 
     
     
       20. The lighting apparatus of  claim 19 , wherein the first light source unit and the second light source unit emit white light.